Mr Stonell, the former director of Master Sealants, will head up the company's latest expansion in the region.
The expansion comes as SD Sealants enjoyed 15 months of record sales.
The company, which provides sealant application, cosmetic repairs and tiling for house builders and commercial businesses, has seen rapid growth in the past two years, creating over 30 jobs across the UK and launching new patches in London and Leeds.
Nick Jones, Managing Director at SD Sealants, said on the appointment: "Lee has invaluable experience in the sealants industry and having run his own successful business for the best part of a decade, he has a wealth of knowledge on how to get the best out of a team.
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"SD has had a very strong couple of years, and after celebrating fifteen continuous months of record profits we're looking forward to expanding the business with highly skilled leaders like Lee at the helm. We're very excited to have someone with his experience coming into the fold as we look to continue driving recruitment and expansion into 2019."
Mr Stonell added: "I'm thrilled to be joining SD at such an exciting time for the business. The sealants industry is going through a difficult period at the moment, with the availability of materials and labour at an all-time low, and so it's brilliant to be working with a company that is going from strength to strength despite weathering a challenging season.
"I'm looking forward to seeing what the future holds for SD and am delighted to be bringing more business and recruitment opportunities to the South East."
(CM/MH)
